PHHueSDK lists disconnected bridge when searching for the available bridges for Android

Question

I am working with two Philips Hue bridges with my app. It's all good when both the bridges are UP and running but when I remove one of the bridge by removing the power source, my app still lists both the bridges on doing the bridge search again. I search for the bridge as mentioned in the official documentation:

public void doBridgeSearch() {
    PHBridgeSearchManager sm = (PHBridgeSearchManager)
            phHueSDK.getSDKService(PHHueSDK.SEARCH_BRIDGE);
    // Start the UPNP Searching of local bridges.
    sm.search(true, true);
}

and the listener

     private PHSDKListener listener = new PHSDKListener() {

        @Override
        public void onCacheUpdated(List<Integer> list, PHBridge phBridge) {
            Log.d(TAG, "onCacheUpdated");

        }

        @Override
        public void onBridgeConnected(PHBridge phBridge, String username) {
            Log.d(TAG, "onBridgeConnected "+username);

        }

        @Override
        public void onAuthenticationRequired(PHAccessPoint phAccessPoint) {
            Log.d(TAG, "onAuthenticationRequired");
            phHueSDK.startPushlinkAuthentication(phAccessPoint);
        }

        @Override
        public void onAccessPointsFound(List<PHAccessPoint> list) {
            Log.d(TAG, "onAccessPointsFound");
            if(list != null && list.size() > 0) {
                phHueSDK.getAccessPointsFound().clear();
                phHueSDK.getAccessPointsFound().addAll(list);
                Log.d(TAG, "no of bridge available "+list.size());
                connect(phHueSDK.getAccessPointsFound().get(0));
            }
        }
    }

In the call back onAccessPointsFound() the list size is 2 even when only one bridge is running. How to get only the available bridges at that time?